Amphibole grain collected in the Portuguese continental margin, offshore from Aveiro. This is a calcic amphibole sourced from the metamorphic rocks (amphibolites) present on the Douro river basin. This grain has the following dimensions: 0,245x0,14x0,07 mm.

This is a calcic amphibole sourced from the metamorphic rocks (amphibolites) present on the Douro river basin. This grain has the following dimensions: offshore from aveiro, PortugalxFotografia de Anfíbola em grão de areia recolhido na margem continental portuguesa ao largo de Aveiro. Trata-se uma anfíbola cálcica com origem nas rochas metamórficas (anfibolitos) presentes na bacia hidrográfica do rio Douro. Este exemplar tem as seguintes dimensões: 0.245x0.14x0.07 mm.xPhotograph off Amphibole grain collected in the Portuguese continental margin, offshore from Aveiro. This is a calcic amphibole sourced from the metamorphic rocks (amphibolites) present on the Douro river basin. This grain has the following dimensions: 0,245x0,14x0,07 mm. mm.